gevent has lots of benefits outside monkeypatching! That said, historically we mostly chose gevent as it seemed like the better interface to greenlet, which we

gevent has lots of benefits outside monkeypatching! That said, historically we mostly chose gevent as it seemed like the better interface to greenlet, which we really liked. For the most part, we were (and in many cases still are) trying to cater to a Python community of beginners. Greenlet-based approaches seemed easier to explain than other options, and sure enough we rarely hear complaints about development complexity, etc.